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神经元SAM68差异调节了替代的最后一个外子拼接,并确保了正确的突触发育和功能
Mohamed Darwish1, Masatoshi Ito2, Yoko Iijima3
1Division of Basic Medical Science and Molecular Medicine, Department of Molecular Life Science, School of Medicine, Tokai University, Kanagawa, Japan; Department of Biochemistry, Faculty of Pharmacy, Cairo University, Cairo, Egypt.
The Journal of biological chemistry
|August 18, 2023
概括
在神经元中,SAM68调节了替代的最后一个外因子 (ALE) 拼接,影响了突触发育. 异常拼接的protocadherin-15 (Pcdh15) 创建可溶性形式,破坏突触功能.
科学领域:
- 分子生物学分子生物学
- 神经科学是一个神经科学.
- 遗传学 遗传学是一种遗传学.
背景情况:
- 在3'非翻译区域 (3'UTR) 的替代拼接对于生物过程至关重要.
- SAM68是一种拼接调节器,通过替代最后的外体 (ALE) 选择控制3'UTR异型多样性.
- 组织特异性3'端拼接的机制和意义尚不清楚.
研究的目的:
- 为了研究SAM68在神经元ALE拼接中的作用.
- 阐明Pcdh15 ALE拼接的机制和功能后果.
- 了解改变的Pcdh15异型对突触发育的影响.
主要方法:
- 在神经元细胞中研究了SAM68-依赖ALE拼接.
- 分析了SAM68与U1小核核糖核蛋白 (snRNP) 的相互作用.
- 通过/卡尔莫杜林依赖蛋白激酶信号调节Pcdh15 ALE拼接的研究.
- 评估可溶性Pcdh15对突触形成和蛋白质相互作用的影响.
主要成果:
- SAM68以剂量依赖的方式调节ALE拼接,在神经元中有差异调节.
- 萨姆68通过U1 snRNP控制了互白素-1受体关联蛋白拼接.
- Pcdh15 ALE拼接是U1 snRNP独立的,但是由Ca2+/calmodulin依赖的蛋白激酶信号调节的.
- 异常 Pcdh15 ALE 拼接产生一种可溶性异型,破坏突触局部化和功能,特别影响抑制突触.
- 可溶性Pcdh15与α-神经素相互作用,并损害神经素-2-诱导的突触形成.
结论:
- SAM68在神经元特定的替代3'UTR拼接中发挥着关键作用.
- 异常的Pcdh15拼接有助于神经精神疾病中的突触功能障碍.
- 替代3'UTR异形选择是突触发育和功能中的关键机制.
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